My dad's aquarium had a 10 inch Oscar, 6 inch jag, and now a dead synodontis lace catfish. He's been skipping on his water changes for about 2 weeks, and yesterday he finally did his water change, and replace one of his two filters and removed a decoration due to the fishes growing size. This morning, he found the catfish dead, and both the jag and Oscar are laying at the bottom, rarely moving. Our water is pretty soft, ph is 7.2, nitrites are 0, ammonia 0, and nitrates are 20. The oscars left eye is also becoming cloudy, so I'm fearing cloudy eye but don't want to dump meds on him until I know for sure. I also turned off the lights to relieve stress but still minimal movement.
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